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CU R R E N T S EN SO R S
4.2.2
Installed busbars in the switchgear panel
This testing procedure includes the influence of applications such as the circuit breaker or
contactor. Installed busbars are used to make the electrical circuit between two neighboring
panels.
If high voltage cables are terminated to switchgear panel, check the installation is
dead.
Protect against any other live parts.
Step 1/5
Verify sensor parameters set in the protection relay with sensor rating plates placed on the
circuit breaker door.
Figure 29: Example of a current sensor label
On protection relay LHMI go to -> Main Menu/Configuration/Analog inputs/Current (3I, CT)
– Primary current = Application nominal current
– Amplitude Corr A = sensor rating plate, phase A
– Amplitude Corr B = sensor rating plate, phase B
– Amplitude Corr C = sensor rating plate, phase C
– Nominal current = Primary current
– Rated secondary Val = Rated secondary value in mV/Hz
– Angle Corr A = sensor rating plate, phase A
– Angle Corr B = sensor rating plate, phase B
– Angle Corr C = sensor rating plate, phase C
Figure 30: Current sensor parameters
2 0
PR IM AR Y T EST IN G
1 VLG 5000 17 C
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